Stimulated Adsorption of Humic Acids on Capped Plasmonic Ag Nanoparticles Investigated by Surface-Enhanced Optical Techniques
| Autor: | Santiago Sánchez-Cortés, Mercedes Iriarte, Armida Torreggiani, Ornella Francioso, Eduardo López-Tobar |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Sánchez-Cortés, Santiago, Francioso Ornella, Lopez-Tobar Eduardo, Torreggiani Armida, Iriarte Mercede, Sanchez-Cortes Santiago, Sánchez-Cortés, Santiago [0000-0002-1081-4644] |
| Rok vydání: | 2019 |
| Předmět: |
Metal nanoparticles
biological material Ag nanoparticles 02 engineering and technology Macromolecule 010402 general chemistry Macromolecular aggregation complex mixtures 01 natural sciences Adsorption Electrochemistry General Materials Science Organic matter Plasmonic nanoparticles surface-enhanced fluorescence Spectroscopy Plasmon chemistry.chemical_classification Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Chemical engineering chemistry Humic acid Surface functionalization surface- enhanced Raman scattering functionalization Silver nanoparticles 0210 nano-technology Ag nanoparticle Organic acid Chemical interactions |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Langmuir 35 (2019): 4518–4526. doi:10.1021/acs.langmuir.9b00190 info:cnr-pdr/source/autori:Francioso O.; Lopez-Tobar E.; Torreggiani A.; Iriarte M.; Sanchez-Cortes S./titolo:Stimulated Adsorption of Humic Acids on Capped Plasmonic Ag Nanoparticles Investigated by Surface-Enhanced Optical Techniques/doi:10.1021%2Facs.langmuir.9b00190/rivista:Langmuir/anno:2019/pagina_da:4518/pagina_a:4526/intervallo_pagine:4518–4526/volume:35 |
| ISSN: | 1520-5827 |
| Popis: | 9 pags. 8 figs. The adsorption of humic substances on Ag nanoparticles (AgNPs) is of crucial environmental importance and determines the toxicity of these NPs and the structure of adsorbed organic matter. In this work, the adsorption of two standard soil and leonardite International Humic Substances Society humic acids was studied on AgNPs of different sizes, shapes (spherical and star-like), and interfacial chemical compositions. Surface-enhanced optical (Raman and fluorescence) spectroscopies were used to follow the specific chemical groups involved in this adsorption. By means of the latter optical techniques, information regarding the binding mechanism and the macromolecular aggregation can be deduced. The influence of the surface chemical composition induced by the different functionalizations of the interfaces of these NPs is highly important regarding the chemical interactions of these complex organic macromolecules. The surface functionalization with positively charged alkyl diamines led to a large increase in the adsorption as well as a strong structural rearrangement of the macromolecule once adsorbed onto the surface. This work was supported by the Spanish Ministerio de Economia, Industria y Competitividad (projects FIS2014- 52212-R and FIS2017-84318-R). |
| Databáze: | OpenAIRE |
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